Nothing really unknown here, it's been well known for years that the Playstation 4 beats the Xbox one in regards to graphics, both fail miserably in comparison to the PC.
As for "culling" it is not a new feature, it has been used for decades, the low-hanging fruits in regards to improving performance via more efficient culling was picked long ago. Before the Xbox 360/Playstation 3 era.
Even the original Xbox had such functionality.
If you want more efficient culling though... Tiled based rendering is where it's at. You can spend more time "looking" at a tile to cut out unnecessary rendering, this is actually where the Xbox One would have an advantage, the ESRAM is nicely suited to such a task.

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